@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;500;600&display=swap');

:root {
  --bg: #120a06;
  --bg-gradient: radial-gradient(ellipse at 50% 0%, #1e120c 0%, #0a0604 100%);
  --body-text: #e8ddd0;

  --surface-bg:
    repeating-linear-gradient(
      87deg, transparent, transparent 3px,
      rgba(0,0,0,0.015) 3px, rgba(0,0,0,0.015) 5px
    ),
    linear-gradient(170deg, #4a2818 0%, #3a2012 45%, #2d1810 60%, #3a2215 100%);
  --surface-border: #8a6a40;
  --surface-border-top: #a08050;
  --surface-border-bottom: #5a3a28;
  --header-border: rgba(180, 140, 100, 0.15);

  --title-color: #d4a574;
  --label-color: #a08070;
  --footer-color: #706050;
  --footer-accent: #b87850;

  --btn-text: #a08070;
  --btn-border: #5a3424;
  --btn-hover-border: #8a5a40;
  --btn-hover-text: #c8b0a0;
  --btn-active-bg: #8a5a40;
  --btn-active-border: #b87850;
  --btn-active-text: #f0e0d0;

  /* Natural key — warm ivory */
  --key-nat-bg: radial-gradient(ellipse at 50% 20%, #faf2dc 0%, #e8dcbe 45%, #d0c09a 100%);
  --key-nat-text: #2a1a10;
  --key-nat-border: #9a8a70;
  --key-nat-border-top: #c0aa88;
  --key-nat-border-bottom: #7a6a50;

  /* Altered key — slightly darker ivory */
  --key-alt-bg: radial-gradient(ellipse at 50% 20%, #e0d4b0 0%, #cec09a 45%, #bca882 100%);
  --key-alt-text: #2a1a10;
  --key-alt-border: #8a7a60;
  --key-alt-border-top: #a89878;
  --key-alt-border-bottom: #6a5a40;

  --key-active-bg: radial-gradient(ellipse at 50% 80%, #4a2818 0%, #2a1a12 55%, #1a0e08 100%);
  --key-active-text: #d4c8a8;
  --key-active-border: #5a4a38;
  --key-active-border-top: #3a2a20;
  --key-active-border-bottom: #6a5a48;

  --keyboard-bg: linear-gradient(180deg, #18120a 0%, #0e0a06 100%);
  --keyboard-border: rgba(180, 140, 100, 0.12);

  --sa-color: #c87850;
  --sa-active-color: #d4a574;

  --slider-track: #3a2218;
  --slider-thumb-gradient: radial-gradient(circle at 40% 35%, #d4a574, #b87850);
  --slider-thumb-border: #d4a574;

  --bellows-bg: #1a0e08;
  --bellows-border: rgba(180,140,100,0.1);
  --bellows-trail: linear-gradient(90deg, transparent, #6a3a28, #d4a574);
  --bellows-pump-color: #f0d0b0;
  --bellows-pump-glow: #d4a57466;

  --drone-text: rgba(160, 120, 80, 0.25);
  --drone-active-text: #d4a574;
  --drone-active-glow: rgba(212, 165, 116, 0.45);

  --overlay-bg: rgba(10, 6, 4, 0.92);

  --accent-rgb: 200, 120, 80;
  --pulse-low: rgba(200, 120, 80, 0.12);
  --pulse-high: rgba(200, 120, 80, 0.32);

  --controls-rail-border: rgba(180, 140, 100, 0.15);
  --preset-section-border: rgba(180, 140, 100, 0.12);
  --flash-bg: rgba(40, 20, 10, 0.92);
  --flash-text: #d4a574;
}

/* ─── Minimalist skin ─── */
.skin-minimal {
  --bg: #f2f0ed;
  --bg-gradient: none;
  --body-text: #111111;
  --surface-bg: #ffffff;
  --surface-border: #cccccc;
  --surface-border-top: #e0e0e0;
  --surface-border-bottom: #bbbbbb;
  --header-border: rgba(0,0,0,0.08);
  --title-color: #111111;
  --label-color: #666666;
  --footer-color: #888888;
  --footer-accent: #333333;
  --btn-text: #555555;
  --btn-border: #cccccc;
  --btn-hover-border: #333333;
  --btn-hover-text: #111111;
  --btn-active-bg: #333333;
  --btn-active-border: #111111;
  --btn-active-text: #ffffff;
  --key-nat-bg: #f8f8f8;
  --key-nat-text: #111111;
  --key-nat-border: #cccccc;
  --key-nat-border-top: #e0e0e0;
  --key-nat-border-bottom: #bbbbbb;
  --key-alt-bg: #e4e4e4;
  --key-alt-text: #333333;
  --key-alt-border: #c0c0c0;
  --key-alt-border-top: #d4d4d4;
  --key-alt-border-bottom: #aaaaaa;
  --key-active-bg: #222222;
  --key-active-text: #f5f5f5;
  --key-active-border: #111111;
  --key-active-border-top: #333333;
  --key-active-border-bottom: #000000;
  --keyboard-bg: #ececec;
  --keyboard-border: rgba(0,0,0,0.1);
  --sa-color: #888888;
  --sa-active-color: #f5f5f5;
  --slider-track: #dddddd;
  --slider-thumb-gradient: radial-gradient(circle at 40% 35%, #555555, #333333);
  --slider-thumb-border: #333333;
  --bellows-bg: #e8e8e8;
  --bellows-border: rgba(0,0,0,0.08);
  --bellows-trail: linear-gradient(90deg, transparent, #aaaaaa, #333333);
  --bellows-pump-color: #222222;
  --bellows-pump-glow: rgba(50,50,50,0.4);
  --drone-text: rgba(0,0,0,0.15);
  --drone-active-text: #111111;
  --drone-active-glow: rgba(0,0,0,0.12);
  --overlay-bg: rgba(240,240,238,0.94);
  --accent-rgb: 50, 50, 50;
  --pulse-low: rgba(50,50,50,0.10);
  --pulse-high: rgba(50,50,50,0.28);
  --controls-rail-border: rgba(0,0,0,0.08);
  --preset-section-border: rgba(0,0,0,0.07);
  --flash-bg: rgba(240,240,238,0.94);
  --flash-text: #333333;
}

/* ─── Night / Zen skin ─── */
.skin-zen {
  --bg: #070614;
  --bg-gradient: radial-gradient(ellipse at 50% 0%, #0e0a24 0%, #050310 100%);
  --body-text: #c8c0e8;
  --surface-bg: linear-gradient(170deg, #0e0a24 0%, #0b0820 45%, #090618 60%, #0a0818 100%);
  --surface-border: #2a1a60;
  --surface-border-top: #3a2a80;
  --surface-border-bottom: #1a1040;
  --header-border: rgba(120,100,200,0.12);
  --title-color: #a090e0;
  --label-color: #7060a0;
  --footer-color: #504070;
  --footer-accent: #8070c0;
  --btn-text: #7060a0;
  --btn-border: #1e1450;
  --btn-hover-border: #5040a0;
  --btn-hover-text: #b0a0d8;
  --btn-active-bg: #3a2a80;
  --btn-active-border: #6050b0;
  --btn-active-text: #e0d8f8;
  --key-nat-bg: radial-gradient(ellipse at 50% 20%, #1e1a4a 0%, #16123a 45%, #13103a 100%);
  --key-nat-text: #a090d0;
  --key-nat-border: #2a2060;
  --key-nat-border-top: #3a3070;
  --key-nat-border-bottom: #1a1850;
  --key-alt-bg: radial-gradient(ellipse at 50% 20%, #181538 0%, #120e2e 45%, #0f0c26 100%);
  --key-alt-text: #8070c0;
  --key-alt-border: #221a50;
  --key-alt-border-top: #302860;
  --key-alt-border-bottom: #161240;
  --key-active-bg: radial-gradient(ellipse at 50% 80%, #2a1a60 0%, #180e40 55%, #0e0828 100%);
  --key-active-text: #c8b8f0;
  --key-active-border: #4a3888;
  --key-active-border-top: #2a1a60;
  --key-active-border-bottom: #5a48a0;
  --keyboard-bg: linear-gradient(180deg, #0c0a20 0%, #080618 100%);
  --keyboard-border: rgba(120,100,200,0.10);
  --sa-color: #6050a0;
  --sa-active-color: #a090e0;
  --slider-track: #1a1440;
  --slider-thumb-gradient: radial-gradient(circle at 40% 35%, #a090e0, #6050a0);
  --slider-thumb-border: #a090e0;
  --bellows-bg: #0a0820;
  --bellows-border: rgba(120,100,200,0.08);
  --bellows-trail: linear-gradient(90deg, transparent, #2a1a60, #7864c8);
  --bellows-pump-color: #c0b0f0;
  --bellows-pump-glow: rgba(120,100,220,0.4);
  --drone-text: rgba(120,100,200,0.20);
  --drone-active-text: #a090e0;
  --drone-active-glow: rgba(120,100,220,0.40);
  --overlay-bg: rgba(7,6,20,0.93);
  --accent-rgb: 120, 100, 220;
  --pulse-low: rgba(120,100,220,0.12);
  --pulse-high: rgba(120,100,220,0.35);
  --controls-rail-border: rgba(120,100,200,0.12);
  --preset-section-border: rgba(120,100,200,0.10);
  --flash-bg: rgba(7,6,20,0.93);
  --flash-text: #a090e0;
}

/* ─── High-Vis skin ─── */
.skin-highvis {
  --bg: #0a0a0a;
  --bg-gradient: none;
  --body-text: #ffffff;
  --surface-bg: #111111;
  --surface-border: #2a2a2a;
  --surface-border-top: #3a3a3a;
  --surface-border-bottom: #1a1a1a;
  --header-border: rgba(245,200,0,0.15);
  --title-color: #f5c800;
  --label-color: #aaaaaa;
  --footer-color: #888888;
  --footer-accent: #f5c800;
  --btn-text: #aaaaaa;
  --btn-border: #333333;
  --btn-hover-border: #f5c800;
  --btn-hover-text: #ffffff;
  --btn-active-bg: #f5c800;
  --btn-active-border: #ffd700;
  --btn-active-text: #000000;
  --key-nat-bg: #2a2a2a;
  --key-nat-text: #ffffff;
  --key-nat-border: #3a3a3a;
  --key-nat-border-top: #444444;
  --key-nat-border-bottom: #222222;
  --key-alt-bg: #1e1e1e;
  --key-alt-text: #cccccc;
  --key-alt-border: #2a2a2a;
  --key-alt-border-top: #383838;
  --key-alt-border-bottom: #181818;
  --key-active-bg: #f5c800;
  --key-active-text: #000000;
  --key-active-border: #ffd700;
  --key-active-border-top: #ffe040;
  --key-active-border-bottom: #d4aa00;
  --keyboard-bg: #0a0a0a;
  --keyboard-border: rgba(245,200,0,0.12);
  --sa-color: #f5c800;
  --sa-active-color: #000000;
  --slider-track: #2a2a2a;
  --slider-thumb-gradient: radial-gradient(circle at 40% 35%, #f5c800, #d4aa00);
  --slider-thumb-border: #f5c800;
  --bellows-bg: #0a0a0a;
  --bellows-border: rgba(245,200,0,0.10);
  --bellows-trail: linear-gradient(90deg, transparent, #4a3a00, #f5c800);
  --bellows-pump-color: #f5c800;
  --bellows-pump-glow: rgba(245,200,0,0.5);
  --drone-text: rgba(245,200,0,0.20);
  --drone-active-text: #f5c800;
  --drone-active-glow: rgba(245,200,0,0.45);
  --overlay-bg: rgba(10,10,10,0.95);
  --accent-rgb: 245, 200, 0;
  --pulse-low: rgba(245,200,0,0.15);
  --pulse-high: rgba(245,200,0,0.45);
  --controls-rail-border: rgba(245,200,0,0.15);
  --preset-section-border: rgba(245,200,0,0.12);
  --flash-bg: rgba(10,10,10,0.95);
  --flash-text: #f5c800;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  background-image: var(--bg-gradient);
  color: var(--body-text);
  display: flex;
  justify-content: center;
  align-items: center;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  transition: background 0.4s, color 0.3s;
}

.container {
  width: 100%;
  max-width: 960px;
  height: calc(100vh - 1.5rem);
  max-height: calc(100vh - 1.5rem);
  margin: 0 0.75rem;
  background: var(--surface-bg);
  border-radius: 16px;
  padding: 0.8rem 0.9rem 0.6rem;
  box-shadow:
    0 8px 40px rgba(0,0,0,0.7),
    inset 0 1px 0 rgba(255,200,150,0.08),
    inset 0 -1px 0 rgba(0,0,0,0.5);
  border: 2px solid var(--surface-border);
  border-top-color: var(--surface-border-top);
  border-bottom-color: var(--surface-border-bottom);
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ─── Header ─── */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
  margin-bottom: 0.4rem;
  padding: 0 0.1rem 0.4rem;
  border-bottom: 1px solid var(--header-border);
}

h1 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--title-color);
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
  flex-shrink: 0;
}

.drone-notes {
  flex: 1;
  text-align: center;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 0.85rem;
  letter-spacing: 0.22em;
  font-weight: 400;
  color: var(--drone-text);
  margin: 0 0.4rem;
  transition: color 0.4s, text-shadow 0.4s;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.drone-notes.has-notes {
  color: var(--drone-active-text);
  text-shadow: 0 0 14px var(--drone-active-glow);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.skin-control {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.skin-control .label {
  font-size: 0.65rem;
  color: var(--label-color);
}

.skin-swatches {
  display: flex;
  gap: 0.22rem;
}

.swatch {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1.5px solid rgba(0,0,0,0.25);
  cursor: pointer;
  padding: 0;
  outline: none;
  flex-shrink: 0;
  transition: transform 0.15s;
}

.swatch.active {
  outline: 2px solid var(--title-color);
  outline-offset: 1px;
  transform: scale(1.15);
}

/* ─── Fullscreen button ─── */
.fullscreen-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 3px;
  background: transparent;
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  color: var(--label-color);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
  flex-shrink: 0;
}

.fullscreen-btn:hover {
  border-color: var(--btn-hover-border);
  color: var(--btn-hover-text);
}

.fullscreen-btn svg {
  width: 100%;
  height: 100%;
}

/* ─── Keyboard ─── */
.keyboard {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px 6px;
  background: var(--keyboard-bg);
  border-radius: 8px;
  border: 1px solid var(--keyboard-border);
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.5);
  margin-bottom: 0.2rem;
  /* Wooden grain rail at bottom */
  position: relative;
}

.keyboard::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 6px;
  background: linear-gradient(180deg, transparent, rgba(0,0,0,0.3));
  border-radius: 0 0 8px 8px;
  pointer-events: none;
}

.octave-row {
  display: flex;
  align-items: flex-end; /* natural keys anchor at bottom; altered keys stick up from top */
  gap: 4px;
  flex: 1;
  min-height: 44px;
}

.octave-label {
  width: 14px;
  min-width: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 0.6rem;
  font-style: italic;
  color: var(--label-color);
  opacity: 0.6;
  flex-shrink: 0;
  padding-bottom: 2px;
}

/* ── Base key style ── */
.key {
  flex: 1;
  min-width: 0;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s, transform 0.08s;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  position: relative;
  padding: 0 0 5px;
  -webkit-tap-highlight-color: transparent;
}

/* ── Natural keys: full-height, ivory, rounded teardrop bottom ── */
.key.natural {
  align-self: stretch;
  flex: 1.1;
  background: var(--key-nat-bg);
  color: var(--key-nat-text);
  border: 1px solid var(--key-nat-border);
  border-top-color: var(--key-nat-border-top);
  border-bottom-color: var(--key-nat-border-bottom);
  border-radius: 5px 5px 42% 42% / 5px 5px 18px 18px;
  box-shadow:
    0 4px 8px rgba(0,0,0,0.4),
    0 1px 2px rgba(0,0,0,0.2),
    inset 0 2px 0 rgba(255,255,240,0.65),
    inset 0 -4px 6px rgba(0,0,0,0.06);
}

/* ── Altered keys: shorter, elevated (sits at top), teardrop bottom ── */
.key.altered {
  align-self: flex-start;
  height: 68%;
  flex: 0.88;
  background: var(--key-alt-bg);
  color: var(--key-alt-text);
  border: 1px solid var(--key-alt-border);
  border-top-color: var(--key-alt-border-top);
  border-bottom-color: var(--key-alt-border-bottom);
  border-radius: 4px 4px 40% 40% / 4px 4px 14px 14px;
  box-shadow:
    0 3px 6px rgba(0,0,0,0.45),
    0 1px 2px rgba(0,0,0,0.25),
    inset 0 2px 0 rgba(255,255,240,0.4),
    inset 0 -3px 5px rgba(0,0,0,0.08);
}

.key .note-name {
  pointer-events: none;
  font-size: 0.78rem;
  letter-spacing: 0.01em;
  line-height: 1;
}

/* Active state */
@keyframes reedPulse {
  0%, 100% { box-shadow: 0 0 6px var(--pulse-low), 0 1px 2px rgba(0,0,0,0.4), inset 0 3px 6px rgba(0,0,0,0.5); }
  50%       { box-shadow: 0 0 20px var(--pulse-high), 0 1px 2px rgba(0,0,0,0.4), inset 0 3px 6px rgba(0,0,0,0.5); }
}

.key:active,
.key.active {
  background: var(--key-active-bg);
  color: var(--key-active-text);
  border-color: var(--key-active-border);
  border-top-color: var(--key-active-border-top);
  border-bottom-color: var(--key-active-border-bottom);
  box-shadow:
    0 1px 2px rgba(0,0,0,0.4),
    inset 0 3px 6px rgba(0,0,0,0.5);
  transform: translateY(2px);
}

.key.active {
  animation: reedPulse 1.8s ease-in-out infinite;
}

/* Sa dot marker */
.key.sa .note-name::after {
  content: '\2022';
  display: inline;
  font-size: 0.4rem;
  margin-left: 1px;
  color: var(--sa-color);
  vertical-align: top;
}

.key.sa.active .note-name::after {
  color: var(--sa-active-color);
}

/* ─── Controls rails ─── */
.controls-rail {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0.35rem 0.15rem;
  border-top: 1px solid var(--controls-rail-border);
  flex-shrink: 0;
}

.controls-tone {
  border-bottom: 1px solid var(--controls-rail-border);
  margin-bottom: 0.3rem;
}

.rail-divider {
  width: 1px;
  height: 16px;
  background: var(--controls-rail-border);
  flex-shrink: 0;
}

.controls-rail .bellows-indicator {
  flex: 1;
  min-width: 36px;
  max-width: 72px;
  height: 5px;
  margin: 0;
}

.force-group,
.tuning-group,
.volume-group,
.sa-group {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.force-group .label,
.tuning-group .label,
.volume-group .label,
.sa-group .label {
  font-size: 0.66rem;
  color: var(--label-color);
  letter-spacing: 0.03em;
}

.sa-shift-btn {
  background: transparent;
  color: var(--btn-text);
  border: 1px solid var(--btn-border);
  border-radius: 3px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  cursor: pointer;
  transition: all 0.15s;
  padding: 0;
  line-height: 1;
  flex-shrink: 0;
}

.sa-shift-btn:hover {
  border-color: var(--btn-hover-border);
  color: var(--btn-hover-text);
}

.sa-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--title-color);
  min-width: 1.8em;
  text-align: center;
  letter-spacing: 0.02em;
}

.tuning-btn {
  background: transparent;
  color: var(--btn-text);
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  padding: 0.22rem 0.52rem;
  font-size: 0.72rem;
  cursor: pointer;
  transition: all 0.2s;
}

.tuning-btn:hover  { border-color: var(--btn-hover-border); color: var(--btn-hover-text); }
.tuning-btn.active { background: var(--btn-active-bg); border-color: var(--btn-active-border); color: var(--btn-active-text); }

.pump-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  background: transparent;
  color: var(--btn-text);
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  padding: 0.22rem 0.52rem;
  font-size: 0.72rem;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.03em;
  font-family: inherit;
}

.pump-btn:hover  { border-color: var(--btn-hover-border); color: var(--btn-hover-text); }
.pump-btn.active { background: var(--btn-active-bg); border-color: var(--btn-active-border); color: var(--btn-active-text); }

.pump-icon { font-size: 0.5rem; line-height: 1; }

.force-slider,
.volume-slider {
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--slider-track);
  border-radius: 2px;
  outline: none;
}

.force-slider  { flex: 1; max-width: 140px; }
.volume-slider { width: 52px; }

.force-slider::-webkit-slider-thumb,
.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--slider-thumb-gradient);
  cursor: pointer;
  border: 1px solid var(--slider-thumb-border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

.force-slider::-moz-range-thumb,
.volume-slider::-moz-range-thumb {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--slider-thumb-gradient);
  cursor: pointer;
  border: 1px solid var(--slider-thumb-border);
}

.force-value {
  font-size: 0.62rem;
  color: var(--label-color);
  min-width: 1.5em;
  text-align: right;
}

/* ─── Bellows indicator ─── */
.bellows-indicator {
  height: 5px;
  background: var(--bellows-bg);
  border-radius: 3px;
  overflow: hidden;
  position: relative;
  border: 1px solid var(--bellows-border);
}

.bellows-trail {
  height: 100%;
  width: 100%;
  background: var(--bellows-trail);
  transform-origin: left;
  transform: scaleX(0.5);
  transition: none;
}

.bellows-pump {
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--bellows-pump-color);
  border-radius: 2px;
  box-shadow: 0 0 5px var(--bellows-pump-glow);
}

/* ─── Preset section ─── */
.preset-section {
  border-top: 1px solid var(--preset-section-border);
  padding: 0.22rem 0.1rem 0.15rem;
  flex-shrink: 0;
}

.preset-tabs {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.22rem;
  flex-wrap: wrap;
}

.preset-tab {
  background: transparent;
  color: var(--label-color);
  border: 1px solid var(--btn-border);
  border-radius: 3px;
  padding: 0.22rem 0.5rem;
  font-size: 0.74rem;
  cursor: pointer;
  letter-spacing: 0.03em;
  font-family: inherit;
  transition: all 0.18s;
}

.preset-tab:hover:not(.active) {
  border-color: var(--btn-hover-border);
  color: var(--btn-hover-text);
}

.preset-tab.active {
  background: var(--btn-active-bg);
  border-color: var(--btn-active-border);
  color: var(--btn-active-text);
}

.preset-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-bottom: 0.18rem;
  min-height: 1.4rem;
}

.preset-btn {
  background: transparent;
  color: var(--btn-text);
  border: 1px solid var(--btn-border);
  border-radius: 3px;
  padding: 0.22rem 0.48rem;
  font-size: 0.74rem;
  cursor: pointer;
  font-family: 'Playfair Display', Georgia, serif;
  letter-spacing: 0.02em;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.preset-btn:hover:not(:disabled) {
  border-color: var(--btn-hover-border);
  color: var(--btn-hover-text);
}

.preset-btn.active {
  background: var(--btn-active-bg);
  border-color: var(--btn-active-border);
  color: var(--btn-active-text);
}

.preset-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.clear-btn {
  background: transparent;
  color: var(--btn-text);
  border: 1px solid var(--btn-border);
  border-radius: 3px;
  padding: 0.22rem 0.52rem;
  font-size: 0.74rem;
  cursor: pointer;
  letter-spacing: 0.03em;
  font-family: inherit;
  transition: all 0.18s;
  margin-left: auto;
}

.clear-btn:hover:not(:disabled) {
  border-color: var(--btn-hover-border);
  color: var(--btn-hover-text);
}

.clear-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.slots-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.section-label {
  font-size: 0.58rem;
  color: var(--label-color);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  min-width: 3rem;
  flex-shrink: 0;
}

.slot {
  display: flex;
  align-items: stretch;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--btn-border);
}

.slot-load {
  flex: 1;
  min-width: 64px;
  max-width: 100px;
  padding: 0.22rem 0.4rem;
  font-size: 0.72rem;
  background: transparent;
  color: var(--btn-text);
  border: none;
  cursor: pointer;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: 'Playfair Display', Georgia, serif;
  letter-spacing: 0.02em;
  transition: background 0.15s, color 0.15s;
}

.slot-load.filled { color: var(--btn-hover-text); }
.slot-load:hover:not(:disabled) { background: var(--btn-active-bg); color: var(--btn-active-text); }

.slot-save {
  width: 26px;
  flex-shrink: 0;
  padding: 0;
  font-size: 0.68rem;
  background: transparent;
  color: var(--label-color);
  border: none;
  border-left: 1px solid var(--btn-border);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  line-height: 1;
}

.slot-save:hover:not(:disabled) { background: var(--btn-active-bg); color: var(--btn-active-text); }

.slot-load:disabled,
.slot-save:disabled { opacity: 0.4; cursor: not-allowed; }

/* ─── Flash message ─── */
.flash-msg {
  position: absolute;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--flash-bg);
  color: var(--flash-text);
  font-size: 0.68rem;
  padding: 0.28rem 0.75rem;
  border-radius: 4px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s;
  white-space: nowrap;
  z-index: 10;
}

.flash-msg.visible { opacity: 1; }

/* ─── Footer ─── */
footer {
  text-align: center;
  padding: 0.25rem 0.25rem 0;
  flex-shrink: 0;
}

footer p {
  font-size: 0.56rem;
  color: var(--footer-color);
  letter-spacing: 0.02em;
}

footer strong { color: var(--footer-accent); }

/* ─── Start overlay ─── */
.start-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
  backdrop-filter: blur(4px);
  transition: opacity 0.5s;
}

.start-overlay.hidden { opacity: 0; pointer-events: none; }

.start-box { text-align: center; padding: 2.5rem; }

.start-box h2 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 2.2rem;
  font-weight: 500;
  color: var(--title-color);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  text-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

.start-box p {
  font-size: 0.8rem;
  color: var(--label-color);
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
}

.start-btn {
  background: transparent;
  color: var(--title-color);
  border: 1px solid var(--btn-hover-border);
  border-radius: 8px;
  padding: 0.6rem 2rem;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.25s;
  letter-spacing: 0.06em;
}

.start-btn:hover {
  background: var(--btn-active-bg);
  color: var(--btn-active-text);
  border-color: var(--btn-active-border);
}

/* ─── Fullscreen: fill the whole display, no side bars ─── */
:fullscreen body,
:-webkit-full-screen body {
  align-items: stretch;
  justify-content: stretch;
}

:fullscreen .container,
:-webkit-full-screen .container {
  max-width: 100%;
  width: 100%;
  height: 100vh;
  max-height: 100vh;
  margin: 0;
  border-radius: 0;
  border-left: none;
  border-right: none;
}

/* ─── Responsive ─── */
@media (max-width: 600px) {
  .container {
    margin: 0 0.4rem;
    padding: 0.6rem 0.5rem 0.4rem;
    border-radius: 12px;
    height: calc(100vh - 0.8rem);
    max-height: calc(100vh - 0.8rem);
  }

  h1 { font-size: 1.05rem; }

  .key.natural { border-radius: 4px 4px 38% 38% / 4px 4px 14px 14px; }
  .key.altered  { border-radius: 3px 3px 36% 36% / 3px 3px 11px 11px; }
  .key .note-name { font-size: 0.68rem; }

  .volume-slider { width: 36px; }
  .force-slider { max-width: 100px; }
  .controls-rail { gap: 0.3rem; padding: 0.25rem 0.1rem; }

  .start-box h2 { font-size: 1.6rem; }

  .keyboard { gap: 4px; padding: 6px 4px; }
  .octave-row { gap: 3px; min-height: 38px; }
  .octave-label { width: 11px; min-width: 11px; font-size: 0.52rem; }

  .skin-control .label { display: none; }
  .section-label { min-width: 2.5rem; font-size: 0.52rem; }
}

@media (max-width: 400px) {
  .key .note-name { font-size: 0.58rem; }
  .keyboard { gap: 3px; padding: 4px 2px; }
  .octave-row { gap: 2px; min-height: 34px; }
}